package com.blandware.atleap.common.util;

import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.text.DecimalFormat;
import java.text.ParseException;


/**
 * <p>This class converts a Double to a double-digit String
 * (and vise versa) by BeanUtils when copying properties.
 * Registered for use in BaseAction.
 * </p>
 * <p><a href="CurrencyConverter.java.html"><i>View Source</i></a>
 * </p>
 *
 * @author Matt Raible <a href="mailto:matt@raibledesigns.com">&lt;matt@raibledesigns.com&gt;</a>
 * @version $Revision: 1.5 $ $Date: 2005/08/02 14:53:32 $
 */
public class CurrencyConverter implements Converter {
	//~ Instance fields ========================================================

	protected transient final Log log = LogFactory.getLog(CurrencyConverter.class);
	protected final DecimalFormat formatter = new DecimalFormat("###,###.00");

	//~ Methods ================================================================

	/**
	 * Converts a String to a Double and a Double to a String
	 *
	 * @param type  the class type to output
	 * @param value the object to convert
	 * @return object the converted object (Double or String)
	 */
	public final Object convert(final Class type, final Object value) {
		// for a null value, return null
		if ( value == null ) {
			return null;
		} else {
			if ( value instanceof String ) {
				if ( log.isDebugEnabled() ) {
					log.debug("value (" + value + ") instance of String");
				}

				try {
					if ( StringUtils.isBlank(String.valueOf(value)) ) {
						return null;
					}

					if ( log.isDebugEnabled() ) {
						log.debug("converting '" + value + "' to a decimal");
					}

					//formatter.setDecimalSeparatorAlwaysShown(true);
					Number num = formatter.parse(String.valueOf(value));

					return new Double(num.doubleValue());
				} catch ( ParseException pe ) {
					pe.printStackTrace();
				}
			} else if ( value instanceof Double ) {
				if ( log.isDebugEnabled() ) {
					log.debug("value (" + value + ") instance of Double");
					log.debug("returning double: " + formatter.format(value));
				}

				return formatter.format(value);
			}
		}

		throw new ConversionException("Could not convert " + value + " to " +
		        type.getName() + "!");
	}
}
